Blar i NTNU Open på forfatter "Hillestad, Magne"
-
Demonstration of non-linear model predictive control for optimal flexible operation of a CO2 capture plant
Mejdell, Thor; Kvamsdal, Hanne Marie; Hauger, S.O.; Gjertsen, Fredrik; Tobiesen, Finn Andrew; Hillestad, Magne (Peer reviewed; Journal article, 2022)Due to the penetration of renewable intermittent energy, there is a need for coal and natural gas power plants to operate flexibly with variable load. This has resulted in an increasing interest in flexible and operational ... -
Demonstration of non-linear model predictive control of post-combustion CO2 capture processes
Hauger, Svein Olav; Flø, Nina Enaasen; Kvamsdal, Hanne Marie; Gjertsen, Fredrik; Mejdell, Thor; Hillestad, Magne (Journal article; Peer reviewed, 2019)Nonlinear model predictive control applications have been deployed on two large pilot plants for post combustion CO2 capture. The control objective is formulated in such a way that the CO2 capture ratio is controlled at a ... -
Design configurations of the methanol synthesis loop
Bøhn, Kristian (Master thesis, 2011)In recent years the chemical industry has undergone considerable changes due to increased environmental regulations and energy costs. This master thesis has evaluated three different design considerations of the methanol ... -
Development of Solvent Degradation Models for Amine-Based CO2 Capture
Braakhuis, Lucas (Doctoral theses at NTNU;2024:54, Doctoral thesis, 2024)Carbon capture and storage can be essential for achieving short-term emission reductions to reach climate goals and realizing the decarbonization of hard-to-abate sectors in the future. Aside from logistical and political ... -
Direct hydrogenation of carbon dioxide to methanol: Systematic generation of multi-stage designs
Hillestad, Magne (Peer reviewed; Journal article, 2023)Commercial methanol catalysts based on Cu/ZnO/Al2O3 are less effective applied to direct hydrogenation of CO2 to methanol. The main reason is that the catalyst deactivation increases with the water pressure and temperature, ... -
Dynamic modeling of the solvent regeneration part of a CO2 capture plant
Enaasen, Nina; Tobiesen, Finn Andrew; Kvamsdal, Hanne Marie; Hillestad, Magne (Journal article; Peer reviewed, 2013)In this work, a system of unit operations is modeled and implemented in MATLAB for dynamic simulation of the regeneration part of the CO2 capture process. The system consists of a stripper, a reboiler and a condenser, and ... -
Effect of Amine Volatility on Aerosol Droplet Development in Absorption Columns
Majeed, Hammad; Knuutila, Hanna K; Hillestad, Magne; Svendsen, Hallvard Fjøsne (Journal article; Peer reviewed, 2017)In absorption processes aerosols are generated by spontaneous condensation or desublimation processes in supersaturated gas phases. Amine volatility is a vital screening parameter for amines to be used in CO2 capture. ... -
Energy Utilization in EDC Cracking
Karlsen, Stine (Master thesis, 2011)The exergy losses in the thermal cracking of 1,2-dichloroethane (EDC) have been investigated for the EDC cracker in INEOS' vinyl chloride monomer (VCM) plant at Rafnes in Norway. This process section is the most energy ... -
Enhancing the efficiency of power- and biomass-to-liquid fuel processes using fuel-assisted solid oxide electrolysis cells
Nielsen, Anders; Ostadi, Mohammad; Austbø, Bjørn; Hillestad, Magne; del Alamo Serrano, Gonzalo; Burheim, Odne Stokke (Journal article; Peer reviewed, 2022)Power- and biomass-to-liquid fuel processes (PBtL) can utilize renewable energy and residual forestry waste to produce liquid synthetic fuels, which have the potential to mitigate the climate impacts of the current ... -
Exergy Analysis of a Process Converting Power and Biomass to a Liquid Fuel
Ostadi, Mohammad; Austbø, Bjørn; Hillestad, Magne (Journal article; Peer reviewed, 2019)A power and biomass to liquid process (PBtL) via Fischer-Tropsch synthesis is exergetically analysed. Synthesis gas is generated through an entrained flow gasifier and extra hydrogen is produced through high temperature ... -
Fischer-Tropsch reaction kinetics: Mathematical modeling and model fitting
Runningen, Anders (Master thesis, 2019)I denne masteroppgaven er en matematisk modell for Fischer-Tropsch syntesen foreslått. Modellen inkluderer effektene av vann på reaksjonskinetikk, selektiviteter, og deaktivering av katalysator. Modellen er basert på ... -
Fischer-Tropsch synthesis over an alumina-supported cobalt catalyst in a fixed bed reactor – Effect of process parameters
Gavrilovic, Ljubisa; Jørgensen, Erik Andreas; Pandey, Umesh; Putta, Koteswara Rao; Rout, Kumar Ranjan; Rytter, Erling; Hillestad, Magne; Blekkan, Edd Anders (Peer reviewed; Journal article, 2020)Fischer-Tropsch synthesis has been investigated over a commercial type cobalt-based catalyst (20 %Co/0.5 %Re/γ-Al2O3) by varying the H2/CO ratio (2.55–1.12), CO conversion (15–75 %), reaction temperature (210 °C, 230 °C), ... -
Gas liquid model for SO2: Study of the regenerable Elsorb process
Hove, Hanne Ekeberg (Master thesis, 2013)This is a study of the regenerable Elsorb Process which is an eco-friendly buffer system for SO2 recovery from gas streams. The buffer system consists of an aqueous solution of Na2HPO4, NaH2PO4 and Na2SO4 formed from solvent ... -
Gas phase amine depletaion created by aerosol formation and growth
Majeed, Hammad; Knuutila, Hanna K; Hillestad, Magne; Svendsen, Hallvard Fjøsne (Journal article; Peer reviewed, 2017)Aerosols are systems of droplets or wet particles suspended in gases. In post combustion CO2 absorption systems aerosols can be formed by spontaneous phase transitions in supersaturated gas phases or by droplets or particles ... -
Heat to H2: Using Waste Heat to Set Up Concentration Differences for Reverse Electrodialysis Hydrogen Production
Skilbred, Ellen Synnøve; Krakhella, Kjersti Wergeland; Haga, Ida Johanne; Pharoah, Jon; Hillestad, Magne; del Alamo Serrano, Gonzalo; Burheim, Odne Stokke (Journal article; Peer reviewed, 2018)The present work suggests two concepts for producing hydrogen by reverse electrodialysis. Reverse electrodialysis is a technology that uses concentration differences to create electrical energy. In this work, the energy ... -
Improving carbon efficiency and profitability of the biomass to liquid process with hydrogen from renewable power
Hillestad, Magne; Ostadi, Mohammad; del Alamo Serrano, Gonzalo; Rytter, Erling; Austbø, Bjørn; Pharoah, Jon; Burheim, Odne Stokke (Journal article; Peer reviewed, 2018)A process where power and biomass are converted to Fischer-Tropsch liquid fuels (PBtL) is compared to a conventional Biomass-to-Liquid (BtL) process concept. Based on detailed process models, it is demonstrated that the ... -
Incoporating Ammonia Synthesis for an Offshore Gas-to-Liquid Process
Lundgren, Mathias Kristoffer (Master thesis, 2016)The world energy demand is increasing, and so is the demand for fertilizer to sustain an exponential population growth. Currently, with low oil prices, asso- ciated natural gas is flared off or re-injected into oil reservoirs ... -
Integration of Renewable Production of Hydrogen in Current Biomass-to-Liquid Biofuels Production Systems
Samuelsen, Eirik (Master thesis, 2017)This report focuses on the production of hydrocarbons in a biomass to liquid (BtL) process with integration of hydrogen production. The hydrogen will be produced from high temperature electrolysis of steam utilizing excess ... -
Interfacial mass transfer limitations in the Fischer-Tropsch synthesis operated in a slurry bubble column at industrial conditions
Vik, Camilla Berge; Solsvik, Jannike; Hillestad, Magne; Jakobsen, Hugo Atle (Journal article; Peer reviewed, 2018)At high catalyst volume fractions the Fischer-Tropsch synthesis (FTS) operated in a slurry bubble column (SBC) is driven into the mass transfer limited regime. This study utilized literature models for the gas-liquid mass ... -
Interfacial mass transfer limitations of the Fischer-Tropsch synthesis operated in a slurry bubble column reactor at industrial conditions
Vik, Camilla Berge; Solsvik, Jannike; Hillestad, Magne; Jakobsen, Hugo Atle (Journal article; Peer reviewed, 2018)At high catalyst volume fractions the Fischer-Tropsch synthesis (FTS) operated in a slurry bubble column (SBC) is driven into the mass transfer limited regime. This study utilized literature models for the gas-liquid mass ...